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Note you will be modifying your HD's if you mess something up here you
could lose everything on all the drives that you mess with. It is
therefore advised that you:
Write down your current configurations. Do this
by writing down all partition info (especially their sizes).
Back up the partitions you are keeping.
What you need to do is partition your drives; creating
space for at least root, swap and /usr partitions and possibly at
least one more for /local if you have the space.
The partitioning can be done in two ways, the first method heavily
relies on the AHDI way of partitioning, the second method nearly
ignores the AHDI partitioning and gives you far more flexibility.
Currently, the second method can only be achieved from a working
OpenBSD/atari system. How this should be done is described in
"upgrading to OpenBSD-labeling".
Using AHDI partitioning:
The partitioning can be done with the AHDI-disk that is
provided with your TT or Falcon. Note that the AHDI partitioning
function erases all partitions on your hard disk even if they are
not changed!
I know this is rather stupid, but don't say I didn't warn you.
You will need the 'chg_part' program from the boot disk to
prepare your hard disk a bit more. This program will change the
partition-id so OpenBSD knows which partitions it can use. The
synopsis is:
chg_part <driveno> <partno> <new_id>
The drive number corresponds with the drive's SCSI-id. The new
id can be selected from one of the following acronyms:
NBU - OpenBSD User partition
NBR - OpenBSD Root partition
NBS - OpenBSD Swap partition
Because OpenBSD cannot be bootloaded (yet) and thus must be
loaded through GEM, it is unwise to use drive 'C'
(drive 0/partition 1) as a OpenBSD partition. When a partition-id
is changed, GEMDOS won't be able to recognize your drive, so be
warned that the drive labels are shifted afterwards. The chg_part
program still recognizes them, take this into account when
re-labeling partitions. Also note that the chg_part process is
reversible. So don't panic if you made a mistake. Just run
chg_part again with the same drive/partition arguments but
supplied the original partition id.
Upgrading to OpenBSD-labeling:
First of all the new disk label functions are fully backwards
compatible with the current (old) behavior, therefore you don't
have to rename partition identifiers if you don't want to. The only
limitation is that you won't be able to write a disklabel to your
harddisk ("Device not configured.").
If you'd like to have the flexibility of the OpenBSD disk label,
the procedure is very simple: change the identifier of the AHDI
partition that contains your OpenBSD root filesystem from NBR to NBD.
Boot OpenBSD; run `disklabel -e sd?'; disklabel will start vi;
quit vi without changing anything; now the disklabel should be
written to the NBD partition. If at this point disklabel tells
you that one or more of your partitions extend past the end of
the unit, then you have an old version of disklabel. Get the
If you like, you can now change the NBD partition id to RAW
(this would for example be necessary if the partition must be
shared with MiNT), but keep in mind that the partition id must
be either NBD or RAW, otherwise OpenBSD won't be able to find the
disklabel. The NBS id (used for a swap partition) is no longer
needed, you can change it to whatever you like (or leave it as
is, if that's what you like :-) ). The same is true for the
NBU id's.
WARNINGS:
- the NBD partition does not necessarily have to be the
partition that contains the OpenBSD root filesystem, but
it *must* be a partition that contains a fast filesystem.
Do *not* try this with a partition that contains a gemdos,
minix or ext2 filesystem; if you do, you'll *loose* a
filesystem.
- Now that you have a real disklabel, you can modify it in
(almost) any way you want. However, if you make a mess of
the disk label, OpenBSD may (or may not) make a mess of
your disk! No freedom without responsibility.
OpenBSD will try to warn you for a possibly dangerous
partition table, but it's up to you to either take that
warning serious or ignore it (there may be good reasons
to ignore the warning, if you know what you're doing).
So what do you do if you have a new disk, that will be exclusively
used by OpenBSD? Very simple: don't let it get `infected' by the
AHDI `virus'. ,-) Just connect the disk to your TT/Falcon; boot
OpenBSD; run `disklabel -e'; you'll see only one large partition `d'
(there won't be any filesystem on it yet); you can create partitions
in any way you want, as you're no longer limited by an AHDI partition
table.
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